Wear on Glock slide

[seastrike]

I have a new to me Glock 17 gen 3. The gun was a police trade in. This is my first Glock but not my first handgun.

My fault for not doing a thorough inspection when buying. When I got home I disassembled the gun to clean it. I found wear marks (rough) on both sides of the inside of the slide (pictured). There are no corresponding marks on the frame or barrel. Serial numbers all match.

There is a lot of external wear on the gun but these marks are the only marks inside the gun (barrel looks almost new).



The gun came with three mags. Two are marked LE/
govt only. The have squared off pieces of metal at the where you look at the top of the loaded mag. These functioned perfectly.

The other mag is also a glock mag but is rounded at the top (inverted U). The mag would not lock the slide back after the last round and you have to pull this mag from the gun (empty or full) to remove rather than dropping free via gravity.



I think I will take a stone to the abrasions inside the slide to make the smooth. Any ideas on how they occured?

Thank you for any insights.

 

[otasan56]

Greetings

My 1989 G17 has the same wear marks as yours, and my G17 has a lot of life left in it. They are quite normal wear and tear marks.

 

[45_auto]

Not sure about the wear mark, but your mag on the right with the rounded cutout is not supposed to drop free. It's working like it's supposed to. It is one of the original glock mags designed to stay in the gun if you accidentally hit the mag release.

 

[Kiln]

Some wear is normal, especially on police guns that sometimes have alot of miles on them. It is no big deal and the G17 will probably last you a looong time. I would recommend replacing the recoil spring though, since you have no idea if it has ever been changed.

 

[Doug S]

Those marks are called "peening", and are very common. They are caused by the cycling of the slide during firing. They will appear quickly on a new gun, but only get to a certain point, and won't get any worse. They are generally more noticable on the 40 caliber Glocks, but they will also be present on the 9mm. As noted above the mag that doesn't drop free is one of the older types, and it isn't supposed to drop free. If it's not locking the slide open, you probably want to replace the mag spring. Again, not uncommon on an older, well used mag.

 

[M1key]

Yours probably has the older locking block if it is a 2-pin model. Newer 3-pin models had the updated block which mostly eliminated the slide peening. As noted above the peening is normal in older models and is really a non-issue. It likely won't get any worse.

Here is a picture of the older locking block on the left and the newer (extended) one on the right.

The mags with a square notch in back are the newer metal lined, drop-free ones and the mag with U-shaped notch is the older non-lined, non-drop free version.

M

 

[seastrike]

Thanks

Everything I wanted to know. Thanks for the great replys. The gun has the newer locking block.

The rest of the internals look very new. I expected the exterior wear (police gun). I guess I really didn't the belive the "shot little" part of police trade ins.

Now I just need to practice with it. We shot 300 through it last night. My 13 year old shot very well with it. My groups were larger than I shoot with my 45 or other 9.

Thanks again.

 

[BHP FAN]

Congrats! I just got my first Glock in about forty years of shooting and collecting, A model 26 9mm.

 

[Doug S]

Of four Gen 3 (newer 3 pin Glocks, 9 & 40 cal) all showed the peening marks relatively quickly. 9mm less than 40. So, I think it's still relatively common. Don't know about the Gen 4 guns.

 

[M1key]

The only peening like that are on three of my Glocks...an older G35, a police trade-in G22C, both in 40 caliber, and a Gen2 model 19. These all have the older-style locking block. None of my other ones have any signs of peening like that with the newer style block.

M

 

[9mmepiphany]

It is considered normal wear.

It is caused by the frame flexing and the locking block raising to strike the underside of the slide.

The magazine with the rounded cutout not falling free when you press the magazine release is normal also. The original specs (Austrian Military) did not specify fall free magazines. You wouldn't either if there was a likelihood you'd eject them in the snow

 

[mgmorden]

Looks like you've already got your answer, but just as more reassurance, my Glock 17 (Gen 2) has the same exact type of marks on it and runs just fine.

 

[REAPER4206969]

Normal.

 

[hentown]

Replace the mag spring in that NFML mag and it'll start locking the slide back after the last shot.